It would probably be better to call these Japanese contractions, because slurs is often, if not usually, used as a synonym for insult--which was my initial impression when I read the title. Then I started to read and realized these weren't insults at all.

Well,

it may be pertinent for some of them, but certainly not all. The title implies that all of the examples are "bad words."

Thanks for your explanation. Now I see. I've found that Wikipedia uses the word "Colloquial contractions".
I hope Gundaetipo-san read this.--Coco 19:05, 18 June 2007 (EDT)